Theodore is correct, pull-down on debug serial RX, it is in the release 
notes https://github.com/beagleboard/beaglebone-ai/issues/24

I assumed the PCB layout had been changed.

On Thursday, 26 September 2019 00:51:41 UTC+1, Paul Richards wrote:
>
> I got 2 BeagleBone AI's from Mouser and started working with them today.
>
> Both of my boards boot and run with the 08-03 build.
>
> I haven't done anything to modify the contents of the filesystem, I merely 
> booted and connected via Cloud9.
>
> On both boards, the main CPU heat sink and the Kingston RAM module 
> immediately 
> heat up and run incredibly hot.  I measured >80C on the CPU and >90C on 
> the RAM module with my IR thermometer.
>
> System load looked fine, nothing was running away and stealing all the CPU.
>
> We intend to use these in lieu of BeagleBone Black modules for a project 
> in the Keck telescopes and if they normally run this hot, it will never 
> work.
>
> S/N range is 4000167 1301 003491 1933
>
>
> Is my experience atypical?  What temperature should these boards nominally 
> run at?
>
>
>
> Paul
>

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